Periodontitis third degree loose teeth are generally recommended to be extracted. 1. Periodontitis is a chronic inflammation caused by the bacteria in plaque invading the periodontal tissues, which can lead to the destruction of periodontal supportive tissues, the formation of periodontal pockets, loss of attachment, and alveolar bone resorption, and with the progression of the disease, the teeth will slowly loosen. 2. The third degree of loosening of periodontitis refers to the teeth to the lip (buccal) lingual activity, the amplitude of more than 2 millimeters, and accompanied by proximal, distal, middle and vertical direction activity. This kind of loosening mostly appears in the late periodontitis, at this time the treatment effect is not good, the prognosis is poor, therefore, it is generally recommended to extract. Periodontitis patients should pay attention to early detection, early treatment, so as not to aggravate the condition, affecting the prognosis.